Wildfire keeps growing

In this undated photo provided by the U.S. Forest Service, the Rim Fire burns near Groveland Ranger Station in Groveland, Calif. The wildfire outside Yosemite National Park  one of more than 50 major brush blazes burning across the western U.S.  more than tripled in size overnight and still threatens about 2,500 homes, hotels and camp buildings.

A smoky haze blankets Virginia Street from the main downtown casino strip in Reno, Nev., on Friday, as health district officials raised an air quality alert Friday to the "red'' unhealthy level for the general population

A smoky haze blankets Virginia Street headed south from the main downtown casino strip in Reno, Nev. on on Friday, Aug. 23, 2013, as health district officials raised an air quality alert to the "red" unhealthy level for the general population. The smoke from a massive wildfire burning 150 miles to the south at Yosemite National Park prompted school officials to keep children inside Friday in Carson City, Washoe and Douglas counties. (AP Photo/Scott Sonner)

U.S. Sen. Jon Tester, D-Mont., looks at the remains of a Lolo Creek home that was destroyed by the West Fork II fire when it swept down the Lolo Creek canyon, Wednesday, Aug. 21, 2013 near Lolo, Mont. The fire burned four other homes as well along the U.S. Highway 12 corridor. (AP Photo/Missoulian, Kurt Wilson)

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FRESNO, Calif. — A giant wildfire raging out of control grew to nearly 200 square miles and spread into Yosemite National Park on Friday, as California Gov. Jerry Brown declared a state of emergency for the city of San Francisco 150 miles away because of the threat to the city’s utilities.

The fire hit the park at the height of summer season, as officials geared up for a busy Labor Day weekend. It has closed some backcountry hiking but was not threatening the Yosemite Valley region, one of California’s most popular tourist destinations that features such iconic sights as the Half Dome and El Capitan rock formations and Bridalveil and Yosemite falls.

The blaze did, however, pose a threat to the lines and stations that pipe power to the city of San Francisco, so Brown, who had declared an emergency for the fire area earlier in the week, made the unusual move of extending the emergency declaration to the city across the state.

San Francisco gets 85 percent of its water from the Yosemite-area Hetch Hetchy reservoir that is about 4 miles from the fire, though that had yet to be affected. But it was forced to shut down two of its three hydroelectric power stations in the area.

The city has so far been able to buy power on the open market and use existing supplies, but further disruptions or damage could have an effect, according to city power officials and the governor’s statement.

The declaration frees funding and resources to help the city and makes it eligible for more federal funds to help with power shortages and outages or water problems.

The weeklong blaze on the timbered slopes of the Western Sierra Nevada has spread to 196 square miles and was only 5 percent contained. It continued to grow in several directions, although “most of the fire activity is pushing to the east right into Yosemite,” said Daniel Berlant, spokesman for the California Department of Forestry and Fire Protection.

The fire was threatening about 5,500 residences, according to the U.S. Forest Service. The blaze has destroyed four homes and 12 outbuildings in several different areas. More than 2,000 firefighters were on the lines and one sustained a heat-related injury.

While the park remained open, the blaze closed a 4-mile stretch of State Route 120, one of three entrances into Yosemite on the west side. Two other western routes and an eastern route were open.

Within the park, the blaze was burning on about 17 square miles in a remote area around Lake Eleanor, Yosemite spokeswoman Kari Cobb said.

Backcountry permits are required to hike in that area, Cobb said. The park was no longer issuing those and had contacted every person who had received a permit to go there. Two roads into that area were closed and occupants of a campground near the Route 120 west entrance were relocated.

“We don’t have anybody we know of in that area based on the permits we have out now,” she said.

The fire was more than 20 miles from Yosemite Valley and skies there were “crystal clear,” Cobb said.

“Right now there are no closures, and no visitor services are being affected in the park,” he said. “We just have to take one day at a time depending on fire activity.”

On Friday, officials issued voluntary evacuation advisories for two new towns — Tuolumne City, population 1,800, and Ponderosa Hills, a community of several hundred — which are about five miles from the fire line, Forest Service spokesman Jerry Snyder said.

A mandatory evacuation order remained in effect for part of Pine Mountain Lake, a summer gated community a few miles from the fire.

“It feels a little bit like a war zone, with helicopters flying overhead, bombers dropping retardant and 10 engine companies stationed on our street,” said Ken Codeglia, a retired Pine Mountain Lake resident who decided to stay to protect his house with his own hoses and fire retardant system. “But if the fire gets very hot and firefighters evacuate, I will run with them.”

Officials previously advised voluntary evacuations of more than a thousand other homes, several organized camps and at least two campgrounds in the area outside the park’s boundary.

More homes, businesses and hotels are threatened in nearby Groveland, a community of 600 about 5 miles from the fire and 25 miles from the entrance of Yosemite.

Usually filled with tourists, the streets are now swarming with firefighters, evacuees, and news crews, said Doug Edwards, owner of Hotel Charlotte on Main Street.

“We usually book out six months solid with no vacancies and turn away 30-40 people a night. That’s all changed,” Edwards said. “All we’re getting for the next three weeks is cancellations. It’s a huge impact on the community in terms of revenue dollars.”

Park fire crews are working to clear brush and other fire fuels from the Merced and Tuolumne Groves of Giant Sequoias as a precaution.

The fire is raging in the same region where a 1987 fire killed a firefighter, burned hundreds of thousands of acres, and forced several thousand people out of their homes.

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Associated Press writers Jason Dearen, Lisa Leff and Andrew Dalton in San Francisco also contributed to this report.